mineral

White tumbled stone, likely quartz or calcite

Indeterminate; possibly quartz (SiO₂) or calcite (CaCO₃)

AI-generated identification · may be incorrect

Small, rounded, opaque white specimen with a dull-to-waxy luster; crystal structure and hardness cannot be confirmed from the image. Quartz has Mohs hardness 7 and specific gravity 2.65; calcite has hardness 3 and specific gravity 2.71.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally occurring mineral fragment that was tumbled or smoothed by abrasion; geological age and formation environment are undetermined.

Uses & applications

Common quartz pieces are used decoratively, in lapidary work, and occasionally jewelry; calcite is mainly a collectible or ornamental stone.

Geological facts

A steel knife or glass-scratch test can help distinguish them: quartz scratches glass, while calcite usually does not. Calcite also effervesces with dilute hydrochloric acid.

Field identification & locations

White quartz is widespread in hydrothermal veins and igneous/metamorphic rocks; calcite commonly occurs in limestone, marble, and veins. Confirm identity with hardness, streak, acid reaction, and a loupe examination.